stage1 新的ast结构 使用pest描述语法

nob_popen.h

@@ -0,0 +1,54 @@
+#ifndef __NOB_POPEN_H__
+#define __NOB_POPEN_H__
+
+#include "nob.h"
+
+typedef struct {
+    Nob_String_Builder out; // stdout 内容
+    int exit_code;          // 实际退出码
+    bool ok;                // 是否成功启动
+} Nob_Cmd_Result;
+
+typedef struct {
+    const char **items;
+    int capacity;
+    int count;
+} Nob_Files;
+
+// 运行命令，捕获 stdout 和退出码（不支持 stdin 和 stderr）
+bool nob_cmd_capture_popen(const char *tname, Nob_Cmd_Result *res) {
+    memset(res, 0, sizeof(*res));
+
+#ifdef _WIN32
+    FILE *fp = _popen(tname, "r");
+#else
+    FILE *fp = popen(tname, "r");
+#endif
+
+    if (!fp) {
+        nob_log(NOB_ERROR, "popen failed");
+        return false;
+    }
+
+    // 读取输出到 String_Builder
+    char buffer[4096];
+    while (fgets(buffer, sizeof(buffer), fp)) {
+        nob_sb_append_cstr(&res->out, buffer);
+    }
+
+    // 获取退出码
+#ifdef _WIN32
+    res->exit_code = _pclose(fp);
+#else
+    res->exit_code = pclose(fp);
+    if (WIFEXITED(res->exit_code))
+        res->exit_code = WEXITSTATUS(res->exit_code);
+#endif
+
+    res->ok = true;
+    return true;
+}
+
+#define nob_cmd_result_free(res) nob_sb_free((res).out)
+
+#endif /* __NOB_POPEN_H__ */